AT90USB647-MU Atmel, AT90USB647-MU Datasheet - Page 138

• Manufacturer Part Number: AT90USB647-MU
• Description: MCU, 8BIT, 64K FLASH, USB, 64QFN
• Manufacturer: Atmel

Specifications of AT90USB647-MU

• Controller Family/series: AT90
• No. Of I/o's: 48
• Eeprom Memory Size: 2KB
• Ram Memory Size: 4KB
• Cpu Speed: 16MHz
• No. Of: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 64KB
• Oscillator Type: External, Internal
• Package: 64QFN EP
• Device Core: AVR
• Family Name: AT90
• Maximum Speed: 20 MHz
• Ram Size: 4 KB
• Operating Supply Voltage: 3.3|5 V
• Data Bus Width: 8 Bit
• Program Memory Type: Flash
• Number Of Programmable I/os: 48
• Interface Type: SPI/TWI/USART/USB
• On-chip Adc: 8-chx10-bit
• Operating Temperature: -40 to 85 °C
• Number Of Timers: 4
• Lead Free Status / Rohs Status: Details

14.10 16-bit Timer/Counter Register Description
14.10.1
14.10.2
138
AT90USB64/128
Timer/Counter1 Control Register A – TCCR1A
Timer/Counter3 Control Register A – TCCR3A
Figure 14-13. Timer/Counter Timing Diagram, with Prescaler (f
•
•
•
The COMnA1:0, COMnB1:0, and COMnC1:0 control the output compare pins (OCnA, OCnB,
and OCnC respectively) behavior. If one or both of the COMnA1:0 bits are written to one, the
OCnA output overrides the normal port functionality of the I/O pin it is connected to. If one or
both of the COMnB1:0 bits are written to one, the OCnB output overrides the normal port func-
tionality of the I/O pin it is connected to. If one or both of the COMnC1:0 bits are written to one,
the OCnC output overrides the normal port functionality of the I/O pin it is connected to. How-
ever, note that the Data Direction Register (DDR) bit corresponding to the OCnA, OCnB or
OCnC pin must be set in order to enable the output driver.
and ICF n
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
Bit 7:6 – COMnA1:0: Compare Output Mode for Channel A
Bit 5:4 – COMnB1:0: Compare Output Mode for Channel B
Bit 3:2 – COMnC1:0: Compare Output Mode for Channel C
(PC and PFC PWM)
TOVn
(CTC and FPWM)
(Update at TOP)
TCNTn
TCNTn
OCRnx
(clk
as TOP)
clk
clk
I/O
(FPWM)
I/O
Tn
/8)
(if used
7
COM1A
1
R/W
0
7
COM3A
1
R/W
0
6
COM1A
0
R/W
0
6
COM3A
0
R/W
0
TOP - 1
TOP - 1
Old OCRnx Value
5
COM1B
1
R/W
0
5
COM3B
1
R/W
0
4
COM1B
0
R/W
0
4
COM3B
0
R/W
0
TOP
TOP
3
COM1C
1
R/W
0
3
COM3C
1
R/W
0
2
COM1C
0
R/W
0
2
COM3C
0
R/W
0
BOTTOM
TOP - 1
New OCRnx Value
clk_I/O
R/W
R/W
1
WGM1
1
0
1
WGM3
1
0
/8)
BOTTOM + 1
0
WGM1
0
R/W
0
0
WGM3
0
R/W
0
TOP - 2
TCCR1
A
TCCR3
A
7593K–AVR–11/09